/Engine/Source/Runtime/Core/Public/Containers/UnrealString.h
Consider using UE::String::FindLast() as an alternative.
int32 Find ( const [FString](API\Runtime\Core\Containers\FString) & SubStr, [ESearchCase::Type](API\Runtime\Core\Misc\ESearchCase__Type) SearchCase, [ESearchDir::Type](API\Runtime\Core\Misc\ESearchDir__Type) SearchDir, int32 StartPosition ) const